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Journal articles on the topic 'Geology, Stratigraphic Cambrian'

Author: Grafiati

Published: 4 June 2021

Last updated: 31 July 2024

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1

Mel’nikov, N. V. "The Vendian–Cambrian Cyclometric Stratigraphic Scale for the Southern and Central Siberian Platform." Russian Geology and Geophysics 62, no. 08 (August 1, 2021): 904–13. http://dx.doi.org/10.2113/rgg20214339.

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Abstract —The general Vendian stratigraphic scale of Siberia, with the uncertain age of the Vendian base ranging from 600 to 630– 640 Ma in most of recent publications, remains worse constrained than the Cambrian scale, in which the boundaries of epochs and stages have been well defined. However, the imperfect classical stratigraphic division has been compensated by data on the cyclicity of the Vendian–Cambrian sedimentary section. The Vendian stratigraphy of the Siberian Platform and the related deposition history with cycles of sedimentation and gaps, as well as the hierarchy of sedimentatio

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2

Idrissi, Assia, Mohamed Saadi, Yassir Astati, Ali Bouayachi, and Kawtar Benyas. "Mapping of Genetic Sequences of the Cambrian Series in the Jbel Saghro Massif, Eastern Anti-Atlas, Morocco: Implications for Eustatic and Tectonic Controls." Iraqi Geological Journal 55, no. 1D (April 30, 2022): 1–20. http://dx.doi.org/10.46717/igj.55.1d.1ms-2022-04-17.

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In this paper, a sedimentological and sequence stratigraphy analysis was performed on Lower and Middle Cambrian deposits of Jbel Saghro, Eastern Anti-Atlas. The field data analysis and the application of sequence stratigraphy concepts were used to classify sedimentary processes and depositional environment, and to define the Lower to Middle Cambrian basin’s detailed geometry. The Cambrian sedimentation of northeastern Saghro indicates a deltaic environment, which is composed of two depositional sequences. These sequences are made of a transgressive system-tract with retrograding sediments and

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Sennikov, N. V., O. T. Obut, N. G. Izokh, A. V. Timokhin, Yu F. Filippov, T. P. Kipriyanova, E. V. Lykova, et al. "THE REGIONAL STRATIGRAPHIC CHART FOR THE ORDOVICIAN OF THE WEST SIBERIAN LOWLAND." Geology and mineral resources of Siberia, no. 3 (2023): 3–39. http://dx.doi.org/10.20403/2078-0575-2023-3-3-39.

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A new version of the Regional stratigraphic chart for the Ordovician of the West Siberian Lowland and the explanatory note, compiled in accordance with the Russian Stratigraphic Code, introduce changes, additional and specified data in comparison with the previous (first edition) chart. Since 1998, the stages of the Ordovician chart were changed completely. New stages – Tremadocian, Floian, Dapingian, Darriwilian, Sandbian, Katian and Hirnantian were adopted by Interdepartmental Stratigraphic Committee of Russia. The independent Regional Stratigraphic Scheme for the Devonian of the West Siberi

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Myrow, P. M., N. C. Hughes, and N. R. McKenzie. "Reconstructing the Himalayan margin prior to collision with Asia: Proterozoic and lower Paleozoic geology and its implications for Cenozoic tectonics." Geological Society, London, Special Publications 483, no. 1 (November 21, 2018): 39–64. http://dx.doi.org/10.1144/sp483.10.

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AbstractReconstructing the stratigraphic architecture of deposits prior to Cenozoic Himalayan uplift is critical for unravelling the structural, metamorphic, depositional and erosional history of the orogen. The nature and distribution of Proterozoic and lower Paleozoic strata have helped elucidate the relationship between lithotectonic zones, as well as the geometries of major bounding faults. Stratigraphic and geochronological work has revealed a uniform and widespread pattern of Paleoproterozoic strata >1.6 Ga that are unconformably overlain by <1.1 Ga rocks. The overlying Neoproteroz

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5

Anderson, Donna, and Mark Longman. "Subsurface Reinterpretation of Ordovician and Devonian Strata in Southwest Wyoming with Implications for Upwarping Across the Transcontinental Arch." Mountain Geologist 55, no. 3 (July 2018): 91–118. http://dx.doi.org/10.31582/rmag.mg.55.3.91.

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A new interpretation of the subsurface geometries of the Ordovician Bighorn Dolomite and overlying Devonian strata across southwestern Wyoming arises from revising the stratigraphy in a core from the Mountain Fuel Supply UPRR #11–19–104–4 well drilled on the crest of the Rock Springs Uplift in 1962. One of only a few wells to penetrate all or part of the Lower Paleozoic succession in the subsurface of southwestern Wyoming, the well was almost continuously cored through the Devonian–Cambrian succession. From a reinterpretation of the stratigraphy in the core, 22 ft of Bighorn Dolomite is recogn

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Elicki, Olaf, and Gerd Geyer. "The Cambrian trilobites of Jordan – taxonomy, systematic and stratigraphic significance." Acta Geologica Polonica 63, no. 1 (March 1, 2013): 1–56. http://dx.doi.org/10.2478/agp-2013-0001.

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Abstract Elicki, O. and Geyer, G. 2013. The Cambrian trilobites of Jordan - taxonomy, systematic and stratigraphic significance. Acta Geologica Polonica, 63(1), 1-56. Warszawa. Marine carbonates and siliciclastic rocks of the Burj Formation in Jordan include paucispecific trilobite associations of the (traditional) Lower-Middle Cambrian boundary interval. Comprehensive new material of these trilobites allows a review of their taxonomy and systematic positions as well as a refined morphological description and a reconsideration of previous interpretations of their stratigraphic position and thu

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7

Jie-Dong, Yang, Sun Wei-Guo, Wang Zong-Zhe, and Wang Yin-Xi. "Sm—Nd isotopic age of Precambrian—Cambrian boundary in China." Geological Magazine 133, no. 1 (January 1996): 53–61. http://dx.doi.org/10.1017/s001675680000724x.

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AbstractBy the new method of Sm—Nd isotopic dating on phosphatic small skeletal fossils and collo-phanite minerals, the Zhongyicun Member of the earliest Cambrian Meishucun Stage at Meishucun in Yunnan, southern China, has been dated at 562.8 ± 7.9 Ma and 562.1 ± 5.7 Ma. Another Sm—Nd age, 570.3 ± 17.1 Ma, has been obtained with samples from the Zhongyicun Member in Yunnan and its stratigraphic equivalents in Sichuan and Xinjiang. These data tend to suggest that the best age estimate of the Precambrian—Cambrian boundary is very likely within the range of 560–570 Ma. As biophosphates and sedime

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8

Kontorovich, A. E., A. I. Varlamov, A. S. Efimov, V. A. Kontorovich, I. V. Korovnikov, V. A. Krinin, S. V. Saraev, N. V. Sennikov, and Yu F. Filippov. "Stratigraphic Scheme of Cambrian Deposits, South of the Cis-Yenisei Area of West Siberia." Russian Geology and Geophysics 62, no. 03 (March 1, 2021): 357–76. http://dx.doi.org/10.2113/rgg20204317.

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Abstract ––In this paper we present a stratigraphic scheme for the subdivision and correlation of the Cambrian deposits in the south of the cis-Yenisei area of West Siberia, which was adopted as a current scheme by the decision of the Interdepartmental Stratigraphic Committee in 2018. This scheme is based on the data from stratigraphic test wells (Lemok-1, Averinskaya-150, Tyiskaya-1, Vostok-1, Vostok-3, Vostok-4, etс.). In the study area, two structure-facies zones were identified: Kas (Lemok-1, Averinskaya-150, Tyiskaya-1, Vostok-4, and Eloguiskaya-1 wells), where sedimentary complexes accum

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9

Lindsay, J. F., M. D. Brasier, D. Dorjnamjaa, R. Goldring, P. D. Kruse, and R. A. Wood. "Facies and sequence controls on the appearance of the Cambrian biota in southwestern Mongolia: implications for the Precambrian–Cambrian boundary." Geological Magazine 133, no. 4 (July 1996): 417–28. http://dx.doi.org/10.1017/s0016756800007585.

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AbstractNeoproterozoic–Cambrian rocks of the Zavkhan Basin (Govi-Altay, western Mongolia) comprise large-scale alternations of siliciclastic- and carbonate-dominated units (cf. ‘Grand Cycles’). Analysis of such depositional sequences near the base of the Cambrian confirms that the distribution of trace fossils, small shelly fossils and calcimicrobial structures was strongly controlled by ecology and taphonomy, corresponding to specific points in a sea-level cycle. Evolution of the Cambrian biota is thus viewed through aseries of narrow time windows, once only for each depositional cycle. Corre

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Korobova, Natalia I., Evgeniya E. Karnyushina, Nadezhda S. Shevchuk, Sergei V. Frolov, Elena A. Bakay, and Grigorii G. Akhmanov. "Geology aspects, sedimentation environments and oil-and-gas bearing capacity of Vendian and Cambrian deposits of Lena-Tunguska basin." Georesursy 24, no. 2 (May 16, 2022): 60–74. http://dx.doi.org/10.18599/grs.2022.2.9.

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At present time several dozen hydrocarbon fields are known in the Vendian-Cambrian complex of the Lena-Tunguska basin, which clearly does not exhaust its potential. The significant stratigraphic interval of the complex, its thickness (up to 3000 m), favorable properties laid down in sedimentogenesis, namely the presence of source, reservoir and seal deposits, allow us to hope for the discovery of new oil and gas deposits. Sedimentological studies of the Vendian-Cambrian complex, carried out using a network of key lithological sections and outcrops, made it possible to create a series of schema

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GEYER, G. "The Fish River Subgroup in Namibia: stratigraphy, depositional environments and the Proterozoic–Cambrian boundary problem revisited." Geological Magazine 142, no. 5 (September 2005): 465–98. http://dx.doi.org/10.1017/s0016756805000956.

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The Fish River Subgroup of the Nama Group, southern Namibia, is restudied in terms of lithostratigraphy and depositional environment. The study is based on partly fine-scaled sections, particularly of the Nababis and Gross Aub Formation. The results are generally in accordance with earlier studies. However, braided river deposits appear to be less widely distributed in the studied area, and a considerable part of the formations of the middle and upper subgroup apparently were deposited under shallowest marine conditions including upper shore-face. Evidence comes partly from sedimentary feature

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12

Ambrose, G. J., P. D. Kruse, and P. E. Putnam. "GEOLOGY AND HYDROCARBON POTENTIAL OF THE SOUTHERN GEORGINA BASIN, AUSTRALIA." APPEA Journal 41, no. 1 (2001): 139. http://dx.doi.org/10.1071/aj00007.

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The Georgina Basin is an intracratonic basin on the central-northern Australian craton. Its southern portion includes a highly prospective Middle Cambrian petroleum system which remains largely unexplored. A plethora of stratigraphic names plagued previous exploration but the lithostratigraphy has now been rationalised using previously unpublished electric-log correlations and seismic and core data.Neoproterozoic and Lower Palaeozoic sedimentary rocks of the southern portion of the basin cover an area of 100,000 km2 and thicken into two main depocentres, the Toko and Dulcie Synclines. In and b

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13

AHN, SOO YEUN, and MAOYAN ZHU. "Lowermost Cambrian acritarchs from the Yanjiahe Formation, South China: implication for defining the base of the Cambrian in the Yangtze Platform." Geological Magazine 154, no. 6 (February 13, 2017): 1217–31. http://dx.doi.org/10.1017/s0016756816001369.

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AbstractTheAsteridium–Heliosphaeridium–Comasphaeridium(AHC) acritarch assemblage is composed of common organic-walled microfossils in the basal Cambrian chert–phosphorite units in South China, indicating that the AHC assemblage can be a useful biostratigraphic tool for the Ediacaran–Cambrian boundary successions in the Yangtze Platform. To test the validity of the AHC acritarch assemblage as a biostratigraphic tool, the stratigraphic range of the AHC acritarch assemblage was confirmed, and its spatial and temporal relationships to other bio- and chemostratigraphic tools were analysed in the Ya

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14

Felitsyn, Sergey B., and Eugeny S. Bogomolov. "Nd isotope composition of the Ediacaran and earliest Cambrian phosphorite nodules and Fe sulphide from the East European Platform." Geological Magazine 157, no. 12 (August 19, 2020): 2081–88. http://dx.doi.org/10.1017/s0016756820000497.

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AbstractAn enhanced concentration of phosphorus has been found at the stratigraphic level of the disappearance of Ediacaran taxa in two areas, the Cis-Dniester region and the Moscow syneclise, on the East European Platform (EEP). The isotope composition of neodymium was determined in Fe sulphide and phosphorite in the same beds. Measured εNd(t) values in diagenetic phosphate nodules are similar to those in iron sulphide from the same layer. During the Ediacaran − Early Cambrian, accumulation of radiogenic Nd in the epeiric basins on the EEP increased progressively from −17.9 and −19.4 in pyrit

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15

GEHLING, JAMES G., SÖREN JENSEN, MARY L. DROSER, PAUL M. MYROW, and GUY M. NARBONNE. "Burrowing below the basal Cambrian GSSP, Fortune Head, Newfoundland." Geological Magazine 138, no. 2 (March 2001): 213–18. http://dx.doi.org/10.1017/s001675680100509x.

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The range of Treptichnus pedum, the index trace fossil for the Treptichnus pedum Zone, extends some 4 m below the Global Standard Stratotype-section and Point for the base of the Cambrian Period at Fortune Head on the Burin Peninsula in southeastern Newfoundland. The identification of zigzag traces of Treptichnus isp., even further below the GSSP than T. pedum in the Fortune Head section, and in other terminal Proterozoic successions around the globe, supports the concept of a gradational onset of three-dimensional burrowing across the Proterozoic–Cambrian boundary. Although T. pedum remains a

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16

Ripperdan, R. L., M. Magaritz, and J. L. Kirschvink. "Carbon isotope and magnetic polarity evidence for non-depositional events within the Cambrian-Ordovician Boundary section near Dayangcha, Jilin Province, China." Geological Magazine 130, no. 4 (July 1993): 443–52. http://dx.doi.org/10.1017/s0016756800020525.

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AbstractCarbon isotope and magnetic polarity stratigraphic results from the Cambrian-Ordovician Boundary section at Xiaoyangqiao, near Dayangcha, Jilin Province, China, in comparison to a contemporaneous section at Black Mountain, Australia, indicate strata equivalent to major portions of the Australian sequence are either absent or are restricted to highly condensed intervals. These intervals are correlative with regressive sea level events identified in Australia and western North America, suggesting regional or eustatic sea level changes strongly influenced deposition of the Xiaoyangqiao se

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17

Hughes, Nigel C. "Biostratigraphical dating conundrums in the Cambrian and earlier stratigraphy of the Indian subcontinent." Journal of Palaeosciences 66, no. (1-2) (December 31, 2017): 1–15. http://dx.doi.org/10.54991/jop.2017.275.

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Dating rocks by using fossils remains one of the most important stratigraphic tools both for Phanerozoic sedimentary rocks and, increasingly, for older rocks too. Inevitably situations arise in which different types of data offer seemingly contradictory indications of age, of which several examples from Cambrian and earlier rocks of Indian subcontinent are discussed herein. These examples highlight the main kinds of biostratigraphical conundrums and their resolution, their role in moving stratigraphic geology forward, and also surprising ways in which they are misused. The growth of geological

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18

Gubin, I. A., A. E. Kontorovich, I. V. Korovnikov, and T. M. Parfenova. "The Structure of Cambrian Deposits of the Vilyui Hemisyneclise, Based on an Integrated Analysis of Drilling and Seismic Data." Russian Geology and Geophysics 62, no. 08 (August 1, 2021): 914–28. http://dx.doi.org/10.2113/rgg20214353.

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Abstract —We present a model of the stratigraphic and lateral distribution of Cambrian deposits in the Vilyui hemisyneclise, based on an analysis of drilling data and interpretation of seismic data. The study shows a series of formations and sequences penetrated by wells (Syugdzher saddle, Khorgochum monocline, Ygyatta depression, Tyukyan–Chybyda monocline, Arbai–Sinyaya megaswell, etc.). In the areas where the Cambrian was not penetrated by wells, the distribution of Cambrian deposit was inferred based on the available seismic data. The distribution of the Kuonamka Horizon formed by Cambrian

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Gubin, Igor A., and Vladimir A. Kontorovich. "Seismogeological structure model of the Anabar-Olenek region." Georesursy 23, no. 1 (March 30, 2021): 70–77. http://dx.doi.org/10.18599/grs.2021.1.7.

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The velocity characteristics of the Upper Proterozoic-Phanerozoic sedimentary cover of the Anabar-Olenek region were studied, in particular, the bimodal character of the distribution interval P-wave velocities was established. Taking into account modern ideas about the chronostratigraphy of sediments encountered by the Charchykskaya-1, Burskaya-3410 and Khastakhskaya-930 deep boreholes, stratification of reflecting horizons was carried out and time sections from previous years were reinterpreted. From the perspective of seismic stratigraphic and seismic facies analysis, the Cambrian, Vendian,

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Żylińska, Anna. "The oldest Cambrian trilobites from the Holy Cross Mountains, Poland: taxonomic, stratigraphic and biogeographic reappraisal." Acta Geologica Polonica 63, no. 1 (March 1, 2013): 57–87. http://dx.doi.org/10.2478/agp-2013-0002.

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Abstract Żylińska, A. 2013. The oldest Cambrian trilobites from the Holy Cross Mountains, Poland: taxonomic, stratigraphic and biogeographic reappraisal. Acta Geologica Polonica, 63 (1), 57-87. Warszawa. Authorship issues are clarified, new photographic documentation is provided and emended systematic descriptions are presented for the oldest Cambrian trilobite taxa from the Holy Cross Mountains (Poland). Biostratigraphic analysis of the fauna allows correlation with the traditional Holmia kjerulfi-group Zone of Scandinavia, the Callavia Zone of Britain and Newfoundland, the lower and middle p

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Álvaro, J. Javier, and Marie-Madeleine Blanc-Valleron. "Stratigraphic and structural framework of the Neoproterozoic Paracuellos Group, Iberian Chains, NE Spain." Bulletin de la Société Géologique de France 173, no. 3 (May 1, 2002): 219–27. http://dx.doi.org/10.2113/173.3.219.

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Abstract The Neoproterozoic Paracuellos Group of the Iberian Chains constitutes the core of two disconnected faulted blocks, named the Paracuellos and Codos antiforms. Precise lithostratigraphic correlations between both areas are not possible due to the structural complexity and because marker beds do not persist laterally. This paper presents a crustal cross-section of the Neoproterozoic axial core (the Paracuellos antiform) based on surface geology, boreholes and seismic reflection profiles. Seismic reflection data reveal that the basement was directly involved by a major Hercynian structur

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22

Phillips, Bruce J., Alan W. James, and Graeme M. Philip. "THE GEOLOGY AND HYDROCARBON POTENTIAL OF THE NORTH-WESTERN OFFICER BASIN." APPEA Journal 25, no. 1 (1985): 52. http://dx.doi.org/10.1071/aj84004.

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Recent petroleum exploration in EP 186 and EP 187 in the north-western Officer Basin has greatly increased knowledge of the regional stratigraphy, structure and petroleum prospectivity of the region. This exploration programme has involved the drilling of two deep stratigraphic wells (Dragoon 1 and Hussar 1) and the acquisition of 1438 km of seismic data. Integration of regional gravity and aeromagnetic data with regional seismic and well data reveals that the Gibson Sub-basin primarily contains a Proterozoic evaporitic sequence. In contrast, the Herbert Sub-basin contains a Late Proterozoic t

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Barr, Sandra M., Chris E. White, Sören Jensen, Teodoro Palacios, and Deanne Van Rooyen. "Ediacaran and Cambrian rocks on Scatarie Island and nearby Hay Island, Avalonian Mira terrane, Cape Breton Island, Nova Scotia, Canada." Atlantic Geology 56 (October 22, 2020): 257–79. http://dx.doi.org/10.4138/atlgeol.2020.011.

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Scatarie Island and adjacent Hay Island, located 2 km east of the eastern tip of the Avalonian Mira terrane of southern Cape Breton Island, Nova Scotia, contain a succession of epiclastic and other sedimentary rocks of inferred Ediacaran to Cambrian age. The age assignment was based previously on lithological comparison with the Main-à-Dieu Group and overlying Bengal Road and MacCodrum formations of the Mira River Group. Detrital zircon grains from two sandstone samples from the Bengal Road Formation yielded typical Avalonian detrital zircon spectra with middle to late Neoproterozoic, Meso- to

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24

Al-Husseini, Moujahed I. "MIDDLE EAST GEOLOGIC TIME SCALE 2010: Early Cambrian Asfar Sequence." GeoArabia 15, no. 1 (January 1, 2010): 137–60. http://dx.doi.org/10.2113/geoarabia1501137.

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ABSTRACT This paper is the first in a series dedicated to the Phanerozoic Cambrian Period, and Neoproterozoic Ediacaran and Cryogenian periods, as represented in the Middle East Geologic Time Scale (ME GTS, see enclosed Chart). It introduces the term Asfar Sequence to represent a regional Early Cambrian time-rock unit, consisting mainly of continental quartz-rich arkosic sandstone, shale and siltstone, which attain a thickness of at least 750 m in Jordan and more than 700 m in Oman. The term “Asfar”, meaning yellow in Arabic, was chosen because it is the standard color for sandstone in ME GTS.

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KOUCHINSKY, ARTEM, STEFAN BENGTSON, YVES GALLET, IGOR KOROVNIKOV, VLADIMIR PAVLOV, BRUCE RUNNEGAR, GRAHAM SHIELDS, JAN VEIZER, EDWARD YOUNG, and KAREN ZIEGLER. "The SPICE carbon isotope excursion in Siberia: a combined study of the upper Middle Cambrian–lowermost Ordovician Kulyumbe River section, northwestern Siberian Platform." Geological Magazine 145, no. 5 (May 23, 2008): 609–22. http://dx.doi.org/10.1017/s0016756808004913.

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AbstractAn integrated, high-resolution chemostratigraphic (C, O and Sr isotopes) and magnetostratigraphic study through the upper Middle Cambrian–lowermost Ordovician shallow-marine carbonates of the northwestern margin of the Siberian Platform is reported. The interval was analysed at the Kulyumbe section, which is exposed along the Kulyumbe River, an eastern tributary of the Enisej River. It comprises the upper Ust'-Brus, Labaz, Orakta, Kulyumbe, Ujgur and lower Iltyk formations and includes the Steptoean positive carbon isotopic excursion (SPICE) studied here in detail from upper Cambrian c

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Brasier, M. D., and P. Singh. "Microfossils and Precambrian–Cambrian boundary stratigraphy at Maldeota, Lesser Himalaya." Geological Magazine 124, no. 4 (July 1987): 323–45. http://dx.doi.org/10.1017/s0016756800016666.

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AbstractAn assemblage of problematical microfossils of Precambrian–Cambrian boundary age is redescribed from the Chert–Phosphorite Member, at the base of the Lower Tal Formation of Maldeota in the Lesser Himalaya of India. This assemblage has previously been ascribed to various ages, from Precambrian to Cretaceous, but is held by us to contain:Maldeotaia bandalica, Protohertzina anabaricagroup, trumpet-shaped elements, acicular elements A & B, ?Conothecasp.,Ovalithecacf.multicostata, allathecid sp. A,Barbitositheca ansata, Hexangulaconulariacf.formosa, Coleoloidesaff.typicalis, Hyolithellu

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Letsch, Dominik, Mohamed El Houicha, Albrecht von Quadt, and Wilfried Winkler. "A missing link in the peri-Gondwanan terrane collage: the Precambrian basement of the Moroccan Meseta and its lower Paleozoic cover." Canadian Journal of Earth Sciences 55, no. 1 (January 2018): 33–51. http://dx.doi.org/10.1139/cjes-2017-0086.

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This article provides stratigraphic and geochronological data from a central part of Gondwana’s northern margin — the Moroccan Meseta Domain. This region, located to the north of the Anti-Atlas area with extensive outcrops of Precambrian and lower Paleozoic rocks, has hitherto not received much attention with regard to its Precambrian geology. Detrital and volcanic zircon ages have been used to constrain sedimentary depositional ages and crustal affinities of sedimentary source rocks in stratigraphic key sections. Based on this, a four-step paleotectonic evolution of the Meseta Domain from the

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Sim, Min Sub, and Yong Il Lee. "Sequence stratigraphy of the Middle Cambrian Daegi Formation (Korea), and its bearing on the regional stratigraphic correlation." Sedimentary Geology 191, no. 3-4 (October 2006): 151–69. http://dx.doi.org/10.1016/j.sedgeo.2006.03.016.

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LI, DA, HONG-FEI LING, SHAO-YONG JIANG, JIA-YONG PAN, YONG-QUAN CHEN, YUAN-FENG CAI, and HONG-ZHEN FENG. "New carbon isotope stratigraphy of the Ediacaran–Cambrian boundary interval from SW China: implications for global correlation." Geological Magazine 146, no. 4 (March 26, 2009): 465–84. http://dx.doi.org/10.1017/s0016756809006268.

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AbstractThe Yangtze Platform preserves relatively thick carbonate successions and excellent fossil records across the Ediacaran–Cambrian boundary interval. The intensely studied Meishucun section in East Yunnan was one of the Global Stratotype Section candidates for the Precambrian–Cambrian boundary. However, depositional breaks were suspected in the section and the first appearance of small shelly fossils could not be verified. The Laolin section located in NE Yunnan is more continuous and shows great potential for global correlation of carbon isotope features across the Precambrian–Cambrian

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Hutchinson, Peter J., and Maggie H. Tsai. "Stratigraphic Analysis with Refraction Tomography." Environmental and Engineering Geoscience 25, no. 3 (August 2, 2019): 245–54. http://dx.doi.org/10.2113/eeg-2127.

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ABSTRACT Near-surface seismic refraction tomography imaged the basal contact of the Upper Cambrian silica-rich Mount Simon Formation with that of the underlying Precambrian granite in central Wisconsin. The discrimination between the Mount Simon and underlying non-conformable contact with Precambrian rocks was based upon a p-wave velocity of 1,700 m/s. Refraction tomography imaged deep, broad tidal channels within the Mount Simon consistent with the inference that Mount Simon was deposited in a high-energy near-shore, probably fluvial environment. The Mount Simon is an arenite that has high co

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Korobkin, V. V., A. Ye Chaklikov, A. A. Ismailov, and Zh S. Tulemissova. "LATE PALEOZOIC – MESOZOIC TECTONIC EVOLUTION AND PROSPECTS OF HYDROCARBON EXPLORATION IN THE ALAKOL SEDIMENTARY BASIN (KAZAKHSTAN)." Geodynamics & Tectonophysics 14, no. 5 (October 17, 2023): 0717. http://dx.doi.org/10.5800/gt-2023-14-5-0717.

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Based on the analysis of stratigraphic, lithofacies, and geological and geophysical data, consideration is being given to the main stages in the formation of the basement and cover structures of the Alakol sedimentary basin. For this region, there was developed the substantiation of a scheme of tectonic zoning and there were proposed structural characteristics of faults and lithofacies features of the section. Evidence was found of a complex, multi-stage tectonic evolution. There were discovered potentially promising stratigraphic oil and gas complexes of the Late Paleozoic and Mesozoic. The d

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ŻYLIŃSKA, ANNA, and MONIKA MASIAK. "Cambrian trilobites from Brzechów, Holy Cross Mountains (Poland) and their significance in stratigraphic correlation and biogeographic reconstructions." Geological Magazine 144, no. 4 (April 16, 2007): 661–86. http://dx.doi.org/10.1017/s0016756807003366.

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A revision of the trilobite fauna from Brzechów in the Holy Cross Mountains (Poland) shows that the assemblage consists of Palaeolenus medius (Bednarczyk), Issafeniella orlowinensis (Samsonowicz), Kingaspidoides sanctacrucensis (Czarnocki), Paradoxides (Acadoparadoxides) oelandicus Sjögren, P. (A.) cf. mureroensis Sdzuy and P. (A.) sp. It is earliest Middle Cambrian in age according to the West Gondwana standard of Geyer & Landing (2004) and can be correlated with the Cephalopyge notabilis Zone of Morocco. Moreover, the co-occurrence of the ranges of P. (A.) oelandicus with P. (A.) cf. mur

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HUGHES, NIGEL C., PAUL M. MYROW, N. RYAN MCKENZIE, D. A. T. HARPER, O. N. BHARGAVA, S. K. TANGRI, K. S. GHALLEY, and C. M. FANNING. "Cambrian rocks and faunas of the Wachi La, Black Mountains, Bhutan." Geological Magazine 148, no. 3 (September 14, 2010): 351–79. http://dx.doi.org/10.1017/s0016756810000750.

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AbstractThe Pele La Group in the Wachi La section in the Black Mountains of central Bhutan represents the easternmost exposure of Cambrian strata known in the Himalaya. The group contains a succession of siliciclastic rocks with minor amounts of carbonate, the uppermost unit of which, the Quartzite Formation, bears age-diagnostic trilobite body fossils that are approximately 493 Ma old. Trilobite species includeKaolishania granulosa, Taipaikia glabraand the new speciesLingyuanaspis sangae.A billingsellid brachiopod,Billingsellacf.tonkiniana, is co-occurrent. This fauna is precisely correlated

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Grazhdankin, Dmitriy, Konstantin Nagovitsin, Elena Golubkova, Galina Karlova, Boris Kochnev, Vladimir Rogov, and Vasiliy Marusin. "Doushantuo-Pertatataka–type acanthomorphs and Ediacaran ecosystem stability." Geology 48, no. 7 (April 27, 2020): 708–12. http://dx.doi.org/10.1130/g47467.1.

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Abstract Large (100 to ∼700 µm diameter) spheroidal carbonaceous microfossils ornamented with regularly arranged spinose or branched processes are globally distributed in the Ediacaran (635–542 Ma). These microfossils, collectively known as the Doushantuo-Pertatataka–type acanthomorphs, have been variously interpreted as a polyphyletic assortment of resting stages of eukaryotes, including animals. The stratigraphic range of the acanthomorphs has long been thought to be restricted to the interval between the uppermost Cryogenian glacial deposits and the largest-known carbon isotope excursion in

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Pelechaty, Shane M., John P. Grotzinger, Vladimir A. Kashirtsev, and Vladimir P. Zhernovsky. "Chemostratigraphic and Sequence Stratigraphic Constraints on Vendian-Cambrian Basin Dynamics, Northeast Siberian Craton." Journal of Geology 104, no. 5 (September 1996): 543–63. http://dx.doi.org/10.1086/629851.

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Parcha, S. K., and Birendra P. Singh. "Stratigraphic significance of the Cambrian ichnofauna of the Zanskar region, Ladakh Himalaya, India." Journal of the Geological Society of India 75, no. 3 (March 2010): 503–17. http://dx.doi.org/10.1007/s12594-010-0040-x.

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Shahkarami, Setareh, Luis A. Buatois, M. Gabriela Mángano, James W. Hagadorn, and John Almond. "The Ediacaran–Cambrian boundary: Evaluating stratigraphic completeness and the Great Unconformity." Precambrian Research 345 (August 2020): 105721. http://dx.doi.org/10.1016/j.precamres.2020.105721.

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Chen, Qiong, Guochun Zhao, and Min Sun. "Protracted northward drifting of South China during the assembly of Gondwana: Constraints from the spatial-temporal provenance comparison of Neoproterozoic–Cambrian strata." GSA Bulletin 133, no. 9-10 (January 19, 2021): 1947–63. http://dx.doi.org/10.1130/b35791.1.

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Abstract Neoproterozoic to Paleozoic sedimentation shows systematic temporal-spatial variations within South China, which must be considered in reconstructing geological evolution of South China in response to global plate reorganization from the breakup of Rodinia to the assembly of Gondwana. We use &gt;1000 new U-Pb and Hf isotopic data for detrital zircons from Neoproterozoic–Cambrian strata across the western (i.e., Longmenshan) and eastern (i.e., Wuyishan) margins of South China, coupled with compiled stratigraphic and magmatic information, to constrain change in provenance through ti

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Moynihan, David P., Justin V. Strauss, Lyle L. Nelson, and Colin D. Padget. "Upper Windermere Supergroup and the transition from rifting to continent-margin sedimentation, Nadaleen River area, northern Canadian Cordillera." GSA Bulletin 131, no. 9-10 (March 8, 2019): 1673–701. http://dx.doi.org/10.1130/b32039.1.

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AbstractNeoproterozoic–Cambrian rocks of the Windermere Supergroup and overlying units record the breakup of Rodinia and formation of the northwestern Laurentian ancestral continental margin. Understanding the nature and timing of this transition has been hampered by difficulty correlating poorly dated sedimentary successions from contrasting depositional settings across Mesozoic structures. Here we present new litho- and chemo-stratigraphic data from a Cryogenian–lower Cambrian succession in east-central Yukon (Canada), establish correlations between proximal and distal parts of the upper Win

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Makarova, A. L. "Middle–Upper Cambrian Trilobites of the Genus Nganasanella Rosova, 1963 and Their Stratigraphic Significance." Russian Geology and Geophysics 62, no. 07 (July 1, 2021): 746–64. http://dx.doi.org/10.2113/rgg20194101.

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Abstract —This paper presents a revision for the genus Nganasanella Rosova, 1963, first described in the stratotype of the Kulyumbean Regional Stage of the Kulyumbe River section (northwest of the Siberian Platform). This section is typical of the upper Cambrian sediments of the Kotuy–Igarka facies region, formed in a shallow marine shelf. As shown by the study, the genus comprises seven species. The species N. nganasanensis Rosova, 1963 (type species), N. tavgaensis Rosova, 1963, N. glabella (Kobayashi), 1943, N. granulosa Rosova et Makarova, 2009, and N. vernacula Rosova et Makarova, 2009 ar

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Mel’nikov, N. V., Yu Ya Shabanov, and O. S. Shabanova. "Stratigraphic chart of Cambrian deposits in the Turukhansk–Irkutsk–Olekma region, Siberian Platform." Russian Geology and Geophysics 51, no. 6 (June 2010): 672–83. http://dx.doi.org/10.1016/j.rgg.2010.05.008.

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Smith, Emily F., Francis A. Macdonald, Tanya A. Petach, Uyanga Bold, and Daniel P. Schrag. "Integrated stratigraphic, geochemical, and paleontological late Ediacaran to early Cambrian records from southwestern Mongolia." Geological Society of America Bulletin 128, no. 3-4 (September 2, 2015): 442–68. http://dx.doi.org/10.1130/b31248.1.

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Lu, Chaojin, Zhen Liu, Haibo Jia, Haiqin Tian, Huayao Zou, Quanqi Dai, and Bo Han. "The eogenetic karst of the Cambrian Longwangmiao Formation in the Yangtze Platform: Implications for the eustatic and stratigraphic correlations of Toyonian (Cambrian)." Geological Journal 54, no. 6 (November 26, 2018): 3720–36. http://dx.doi.org/10.1002/gj.3352.

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Read, J. J. "Seismic reflection investigations of the Hellyer orebody and Que-Hellyer volcanics, North West Tasmania." Exploration Geophysics 20, no. 2 (1989): 159. http://dx.doi.org/10.1071/eg989159.

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Two separate seismic reflection surveys have been conducted over Aberfoyle Resources Hellyer orebody and the enclosing Cambrian Que-Hellyer volcanics. The initial survey, conducted as a test case to determine if seismic reflection techniques could detect massive sulphide orebodies at depth, successfully identified the Hellyer orebody, which was found to have a characteristic seismic expression. Identification and mapping of stratigraphic units within the Que-Hellyer volcanics was also possible due to the good geological control available.The second survey did not successfully identify the Hell

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Khomentovsky, V. V. "The Vendian System of Siberia and a standard stratigraphic scale." Geological Magazine 123, no. 4 (July 1986): 333–48. http://dx.doi.org/10.1017/s0016756800033422.

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AbstractIn Siberia Vendian is equated with a Yudoma Complex or Yudomian. Yudomian deposits of the Siberian Platform and adjacent geosynclines differ greatly in facies and thickness. According to the composition and structure of Yudomian deposits, four facies provinces may be recognized on the platform. Local stratigraphic charts for each province are presented and their correlation and possibility to subdivide the Vendian System in Siberia into three horizons or stages are substantiated. The upper stage (Nemakit–Daldyn), on the basis of palaeontological evidence, is in its turn subdivided into

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Evans, James E., Joshua T. Maurer, and Christopher S. Holm-Denoma. "Recognition and significance of Upper Devonian fluvial, estuarine, and mixed siliciclastic-carbonate nearshore marine facies in the San Juan Mountains (southwestern Colorado, USA): Multiple incised valleys backfilled by lowstand and transgressive systems tracts." Geosphere 15, no. 5 (August 9, 2019): 1479–507. http://dx.doi.org/10.1130/ges02085.1.

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Abstract The Upper Devonian Ignacio Formation (as stratigraphically revised) comprises a transgressive, tide-dominated estuarine depositional system in the San Juan Mountains (Colorado, USA). The unit backfills at least three bedrock paleovalleys (10–30 km wide and ≥42 m deep) with a consistent stratigraphy of tidally influenced fluvial, bayhead-delta, central estuarine-basin, mixed tidal-flat, and estuarine-mouth tidal sandbar deposits. Paleovalleys were oriented northwest while longshore transport was to the north. The deposits represent Upper Devonian lowstand and transgressive systems trac

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Cooper, R. A., J. B. Jago, and J. G. Begg. "Cambrian trilobites from Northern Victoria Land, Antarctica, and their stratigraphic implications." New Zealand Journal of Geology and Geophysics 39, no. 3 (September 1996): 363–87. http://dx.doi.org/10.1080/00288306.1996.9514720.

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ZHU, MAOYAN, and XIAN-HUA LI. "Introduction: from snowball Earth to the Cambrian explosion–evidence from China." Geological Magazine 154, no. 6 (October 27, 2017): 1187–92. http://dx.doi.org/10.1017/s0016756817000644.

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The Neoproterozoic–Palaeozoic transition (NPT) around 600 Ma ago was a critical time interval when the Earth experienced fundamental change, manifested as climatic extremes – ‘snowball Earth’ – followed by the emergence and rapid diversification of animals – ‘Cambrian explosion’. How animals and environments co-evolved, and what caused these fundamental changes to the Earth system during the NPT, is a great scientific puzzle, which has been a rapidly developing frontier of interdisciplinary research between bio- and geosciences. South China preserves a complete stratigraphic succession of the

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Evans, D. A., A. Yu Zhuravlev, C. J. Budney, and J. L. Kirschvink. "Palaeomagnetism of the Bayan Gol Formation, western Mongolia." Geological Magazine 133, no. 4 (July 1996): 487–96. http://dx.doi.org/10.1017/s0016756800007615.

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AbstractOriented samples of the Lower Cambrian Bayan Gol Formation from Salaany Gol, Mongolia, were collected at roughly 5 m stratigraphic intervals for palaeomagnetic analysis. Progressive alternatingfield and thermal demagnetization isolated two magnetic components: a present-field overprint, typically removed by 10 mT fields and ~200°C heating; and a high-coercivity, high-unblocking-temperature (550–600 °C), predominantly single-polarity component that was imparted to the rocks prior to early or middle Palaeozoic deformation. Single-polarity magnetization at Salaany Gol contrasts with resul

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Khomentovsky, V. V., and A. S. Gibsher. "The Neoproterozoic–lower Cambrian in northern Govi-Altay, western Mongolia: regional setting, lithostratigraphy and biostratigraphy." Geological Magazine 133, no. 4 (July 1996): 371–90. http://dx.doi.org/10.1017/s001675680000755x.

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AbstractThis paper provides a framework for the stratigraphy and correlation of key sections through the Neoproterozoic–lower Cambrian of the Govi-Altay area, western Mongolia, studied by members of IGCP Project 303. Dzabkhan Formation volcanic rocks at the base of the succession are suggested to have formed during rifting of the Baydrik–Tarbagatay microcontinent in the Baykalian interval (c. 850–650 Ma). Pre-Vendian accretion transformed this rift and adjacent microcontinental fragments into a marginal marine back-arc basin, in which accumulated relatively uninterrupted Neoproterozoic and ear

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